I like to have a lot of information about my environment (mostly for purely geeky reasons), but I've found that most commercially available sensors are expensive, inaccurate, have limited software compatibility, or...

I like to have a lot of information about my environment (mostly for purely geeky reasons), but I've found that most commercially available sensors are expensive, inaccurate, have limited software compatibility, or some combination thereof. I was using a couple of Z-Wave temperature/humidity sensors and a couple of light sensors, but at $50 a pop, there was no way I was going to be able to get all the information I wanted on the house.